第二部分为地震动结束后到液化土中孔压消散时间所产生的地面位移。
Another is the ground displacement taking place after earthquake, which lasts from the end of earthquake to the period of excess pore pressures in sandy soil diffused out.
直接使用FFT由数字地震记录来恢复地面位移可能产生包括虚假的长周期分量在内的不正确结果。
It is possible to yield incorrect results including false long period components, during the restitution of the ground displacement from digital seismograms directly using FFT.
对FFT和所介绍的迭代方法所给出的恢复结果进行比较表明，本文所提出的方法确实改善了地面位移的估计。
Comparing the recovered results of FFT with the displacement obtained by the iteration method shows that the approach proposed in this paper indeed improves the estimation of the ground displacement.
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